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noun 1. a large or excessive amount of something. "a plethora of committees and subcommittees" synonyms: excess, abundance, overabundance, superfluity, surfeit, profusion, more than enough, too many, too much, enough and to spare, superabundance, surplus, glut, flood, torrent, deluge, embarrassment; More 2. MEDICINE an excess of a bodily fluid, particularly blood. Origin mid 16th century (in the medical sense): via late Latin from Greek plēthōrē, from plēthein ‘be full’.


  1. ^ Oxford Dictionary